System for causing impulses to control the production of impulses of different frequency



Oct. 18, l POTTS 1,882,892

SYSTEM FOR GAUSING IMPULSES TO CONTROL THE PRODUCTION OF IMPULSES OF DIFFERENT FREQUENCY Original Filed Sept. 17, 1925 LM Pgrrs A770/PNE/ Patented Oct. 18, 1932 LoUIsM. rows; or nvansron,ILLINoIs-AssIGNomtro WESTERN: ELECTRIC COMPANY INconPonArEn, OF NEW Yonxjn. Y.,' A conron'a'rronor NEW :YORK

SYSTEM roncnusrnc mrULsEsro coiv'rieon flaEritQDuoTroN oi nurU sEs a nrFEEnEN'r FREQUENCI, U P

"Originalapplicationfiled September 17; 925, Serial nofsa'walrteiii N0. 1,7O8,'9 54, dated A rn 1e, ie ze, Divided and this application filed Feb ruary a, 1929. j Serial no. 338,403.

' The present invention relates to improveinents in systems for causing impulses to gen erate and control thef'frequenc'y of other imlpulses of different frequency? An object of the 'inventio'njis toca'usea series of impulses of current toproduce another seriesoit impulses of difi'erent frequency;

A featureofthe invention relates to a re.- lay arrangement responsive to impulses delivered overa circuit at a given frequency to set. up in another'circuit impulses of onehalf that frequency.

This invention has been divided from the application of M. Potts, Serial No; 56,855, filed September 17 ,f1925,"which' became Patent Number 1,7 08,954 onApril 16, 1929. In the application mentioned there has been'disclosed a multiplex voice frequency telegraph system whereby the ordinary equipment employed'in telephone exchange systems may be used for the transmission ofalarge number of telegraph messages, thereby providing ninety-six one-way signaling channels on a single circuit. The terminal apparatus comprises distributor mechanisms consisting of first, second andthird stage distributors.

' The present invention relates to features of the second stage distributors com risin" polar relays responsive to impulses vde ivere over the first stage or third stage distributors (depending upon whether signals are received or transmitted) at a given frequency, to .set up impulses of a different frequency in the second stage distributors.

The invention will now be described having reference to the accompanying drawing which shows schematically a relay arrangement constituting one embodiment of the invention. n a

At the left end of the drawing is shown one of a plurality of incoming signal chan{ nels 22terminated in the alternating current relay 23.. Sixchannels similar to22 are each connected through a start-stop translating mechanism 42 110 distributor 1205 The distributor successively connects each ofithe six channelszone at atim e' to line "Like wise distributor 130 successively connects four lines similar to 416 one at a time to line 418 Atthedilstzint" end' 'tnot illus trated) of line 418 a. similar distributor 18G maybeemployed tof-dist'ribute' the signals from line 418 to -a group ofdistributors12O where the signals will be distributed tore": ceiving line's; 1 V *nnanmmr 130 is controlled by relay 41 i whichis operated from a source of alternat ing current (not shown). Distributor 130 in 'turircontrols distributor 120 throughre- 1ays"; 8;:9*and, 10. Y "If desirable one of the channels may be devoted to synchronizing the distributors at each end of'the line, in which the left contact of relay 1 of the distributor 120 would lead toarontactof switch 770 as shown by the dotted line. r The alternating current relay 23 is designed to maintain its contacts normally closed and responds to current of agiven fre quen cy, such as 800 cycles per second, toopen hold open its contactduring the time that currentis flowing. Associated with the channel 29, is a start-stop translating mechanism42 which, for the sakeof convenience, have been "illustrated schematically. This start-stop mechanism includes a signal-receiving relay a3 which'responds in the usual manner to open circuit conditions to' cause the distributor 42, by means of the receiving magnet 44, to set up by mechanical means, combinations representing the characters received. The start sto-p translator 42 is associated with'the relay distributor 120 by means the circuit'-E, which includes the start magnet 46 of the start-stop translator. The circuit 45 is so connected to the distributor 1520 that the magnet 46 isgoperated at a given point in the cycle of operation of the distributor 120 in order to start the start-sto translator at the proper instant. The distributor 120 consists of twelve counting relays 1 to 6 inclusive, and 121 to 126 inclusive. These relays are arranged to operate and lock in pairs,each pair causing the release of a preceding' 'pair. The ope crating circuits are closed by the polarized relay 9.- 'Relay'9 is'in turn operated by'rela'v 7, which is operated tributor 180.

'Th'e distributing mechanism 130 ass-as periodically theidis;

as the "otherwindingserves to attract the opposite direction. The four-pairs of-re--- a e 1, 15mm l2, -32a1 e 133. a e

a'rearranged' in counting relation to be op erated from the contacts of relay 414.

Assume relaysll and 13l=and relays 12 and 132. are operatedand the other relays ofthe selec tor are unoperated. Relays 13 and 133 operate and relays 11 and 131 release on the next step, and on the next succeeding step relays14 and 134 operate and relays 12 and l32 release. This process continues as long as relay 414 receives impulses.

The relay 7 is arranged to operate through its lower winding whenever the upper windings of the second pair of relays of distributor 130, namely relays 12 and 132 are energized, and through its upper winding whenever the upper windings of the fourth pairsg14- and 134 are energized. In other words, the relay 7 operates once in'each direction'for every cycle of the counting relays 130. Relay 7, on closing its lower contact 2, charges the condenser 415 either with a. positive-or a negative charge depending upon the position of the armature of'relay 8. lVhen relay 7 next closes its upper contact 1-, the condenser discharges through the windings of relays 8, 9 and 10, serving to operate these relays to their other positions. Theefi'ect of the alternate closures of contacts 1 and 2 of relay 7 and contacts 3 and 4.of.relay 8 upon the periodicity of the impulses. impressed upon the upper and lower windings of relay 7 and transmitted from relay 8 tolrelay 9 will now be considered step by step, reference being had to the table belowfor following the change of the position of the armaturesthrough one cycle of operation.

Initial Step Step Step Step position a b c d Rela'y7 cu nt rom'batt y- Step a.On the next current impulse for theposition shownwill be dethrough the windinglof relay 8.*'The con- J;

denser will discharge and the armature of relay 8 will be reversed to make contact with contact 4; The position of thearmatures of relays? and 8 at' the completion of this stepis shown under Step a of the table.

Stc'p'=-b.On" the-' next' current' impulse, which'will be delivered by the upper winding ofrelay 14, the armature of relay 7 is reversed tojmakecont'actwith contact 2 and will assume the position shown. During this stepthe armature of relay ,8 remains in the same position, thatis, it still makes contact wit %01 tat 4 negativ c rr ntifi 6 .1 battery through contact 4 of relay 8 through t eclose co tac .2u e i y" an l th .0611; a

dens er 4.15 wurbejehargd with? negative ha ge hepo i on o theia tmatill s f relays 7 and81 at the completion' of this step isshownl inder fS ep b of t etab' e.

, Step c.-.i-Qn;the next current impulse from relayf12 contact liwjll be closed. A circuit will be completed for thecondenser and its negative charge will flow from condenser 415 over contact 1 through the winding of relay. 8, reversing the 7 position of "its armature toinake contact witheontact 3. The positionof the armatur'es of relays 7 i a'nd8 at the V completion of this Step 0 of the table. 7

18221: $7.011, the, next current impulse, Which will be deliver ed by relay 14, contact 2 offthe armature of relay7 willbe closed. The armature of relay Swill remain in the same position, contact 3 .being' closed, thus permitting the current to flow from the posistep is shown under tive battery to contact 3, contact .2 of, relay 7, and the} condenser will. be chargedwith a initial position and being 'ready to here? versed by the next impulse received by relay 7, since the next impulse" will ,revei'se the armature of relay 7, thus discharging the condenser throughthe winding of relay 8 and reversing the position of its armature. During this cycle, the armatureofrelay 8 has been once on its contact 4 and once on'its contact 3. During this "one cycle of relay 8, however, the armature of relay 7 has described two complete cycles, i. e., it has been twice on itscontact 1 and twice on its contact 2. From this it follows that the armature of relay 8 vibrates at one-halfthe frequency of relay 7. L

Relay 8,. operates in one direction during one cycle of the distributor- 130, and infthe other direction for the next succeeding cycle. The relay9 on each operation closes an operating circuit fo-ra pair of counting relay s relay 8 its armature having returned to its of the distributor 120. A frequency changer (not shown) is so connected to the polarized relay 414 that this relay is operated once in each direction for a complete cycle of the frequency changer, giving two operations of the relay 414 in 1/240th of a second. Since it is necessary for the relay 414 to operate four times to complete a cycle of the distributor 130, said distributor requires 1/ 120th of a second per cycle. Due to the manner in which the relay 7 is connected to the distributor 130, said relay operates once in each direction for each cycle of said distributor. Inasmuch as the relay 9 operates once for every two operations of the relay 7 it follows that each of the counting relays 1, 2, 3, 4, etc, of the distributor 120 requires two operations of the relay 7. Accordingly, for each cycle of the distributor 130, a pair of the counting relays 120 will be operated. This means that the distributor 120 requires 1 /120th of a second per cycle.

All of the code impulses representing messages in the six channels leading to distributor 120 are directed through contacts of the relay 10, over conductor 416, to the contact of relay 11; In a similar manner, the impulses for three other groups of six lines each are directed over conductors 417 to the contacts of relays 12, 13 and 14, respectively. The armatures of these relays 11, 12, 13 and 14 are connected to the contacts of relay 15,-

whereby all impulses representing the messages in four different groups may be directed to the single conductor 418.

In order that the synchronizing impulses may be transmitted from the sending station to the receiving station for synchronizing the sending and receiving distributors, there may be provided a separate channel over which impulses may be transmitted simply for synchronizing purposes at the required time. If desirable, one of the channels shown may be devoted to synchronizing in which case the left contact of relay 1 of distributor 120 would lead to the contact of switch 770 as shown by the dotted line. After the distributors 120 and 130 at the sending station have been set in operation, the switch 770 may be closed to transmit the synchronizing impulses. Thereafter, each time the distributors 120 and 130 arrive at the proper relative phase relation with each other, a circuit is completed from ground through the switch 770 over the contact of relays 1, 10,

11 and 15 to line 418. At the receiving stations these impulses may be used to synchronize the receiving distributors.

What is claimed is:

1. In an electrical system, means for producing a series of impulses of current of one periodicity, a relay connected thereto having two pair of contacts, a source of current an a condenser for receiving and storing a charge from said source of current and a device actuated by the discharge of said condenser all connected to said contacts whereby the charging of said condenser is effected by the closure of one of said pair of contacts and the discharge of said condenser is effected by the closure of the other of said pair of contacts. said device having switching means associated therewith which is connected to said condenser circuits, whereby the frequency of actuation of said device is one-half of the periodicity of said impulses.

2. In a frequency changer, a condenser, two sources of current of opposite polarity, two polarized relays, one of said polarized relays having its armature connected to said condenser and adapted to have its armature vibrated by current impulses of a given periodicity to alternately charge the condenser from one or the other of said sources and to discharge the condenser through the winding of the second relay, the armature and contacts of said second relay being connected to the condenser charging circuit and the two sources of current so that the position of the armature of the second relay determines the polarity of the condenser charges in such a manner that the second relay is actuated at one-half the frequency of said first relay.

3. In a system for causing impulses to control the production of impulses of different frequency, a condenser, two electrical circuits, a polarized relay comprising a pair of contacts adapted to vibrate at the frequency of current impulses received by said relay to alternately open one and close the other of said two circuits, one of said circuits includin said condenser and the winding of a second polarized relay and the other of said circuits including said condenser and two sources of differently polarized current, said second relay being adapted when traversed by a current impulse to close a circuit including one of said current sources and said condenser to charge said condenser with current of a polarity dependent upon the position of the armature of said second relay, whereby the discharge of said condenser through said second relay causes its armature to vibrate at a frequency one-half of that of the frequency of vibration of said first mentioned relay.

In witness whereof, I hereunto subscribe my name this 4th day of February, 1929.

LOUIS M. POTTS. 

